C++ AcpiUtCreateBufferObject函数代码示例

ACPI_STATUS
AcpiExConcatTemplate (
    ACPI_OPERAND_OBJECT     *ObjDesc1,
    ACPI_OPERAND_OBJECT     *ObjDesc2,
    ACPI_OPERAND_OBJECT     **ActualReturnDesc,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_OPERAND_OBJECT     *ReturnDesc;
    UINT8                   *NewBuf;
    UINT8                   *EndTag1;
    UINT8                   *EndTag2;
    ACPI_SIZE               Length1;
    ACPI_SIZE               Length2;


    ACPI_FUNCTION_TRACE ("ExConcatTemplate");


    /* Find the EndTags in each resource template */

    EndTag1 = AcpiUtGetResourceEndTag (ObjDesc1);
    EndTag2 = AcpiUtGetResourceEndTag (ObjDesc2);
    if (!EndTag1 || !EndTag2)
    {
        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
    }

    /* Compute the length of each part */

    Length1 = ACPI_PTR_DIFF (EndTag1, ObjDesc1->Buffer.Pointer);
    Length2 = ACPI_PTR_DIFF (EndTag2, ObjDesc2->Buffer.Pointer) +
                             2; /* Size of END_TAG */

    /* Create a new buffer object for the result */

    ReturnDesc = AcpiUtCreateBufferObject (Length1 + Length2);
    if (!ReturnDesc)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    /* Copy the templates to the new descriptor */

    NewBuf = ReturnDesc->Buffer.Pointer;
    ACPI_MEMCPY (NewBuf, ObjDesc1->Buffer.Pointer, Length1);
    ACPI_MEMCPY (NewBuf + Length1, ObjDesc2->Buffer.Pointer, Length2);

    /* Compute the new checksum */

    NewBuf[ReturnDesc->Buffer.Length - 1] =
            AcpiUtGenerateChecksum (ReturnDesc->Buffer.Pointer,
                                   (ReturnDesc->Buffer.Length - 1));

    /* Return the completed template descriptor */

    *ActualReturnDesc = ReturnDesc;
    return_ACPI_STATUS (AE_OK);
}

ACPI_STATUS
AcpiNsConvertToUnicode (
    ACPI_NAMESPACE_NODE     *Scope,
    ACPI_OPERAND_OBJECT     *OriginalObject,
    ACPI_OPERAND_OBJECT     **ReturnObject)
{
    ACPI_OPERAND_OBJECT     *NewObject;
    char                    *AsciiString;
    UINT16                  *UnicodeBuffer;
    UINT32                  UnicodeLength;
    UINT32                  i;


    if (!OriginalObject)
    {
        return (AE_OK);
    }

    /* If a Buffer was returned, it must be at least two bytes long */

    if (OriginalObject->Common.Type == ACPI_TYPE_BUFFER)
    {
        if (OriginalObject->Buffer.Length < 2)
        {
            return (AE_AML_OPERAND_VALUE);
        }

        *ReturnObject = NULL;
        return (AE_OK);
    }

    /*
     * The original object is an ASCII string. Convert this string to
     * a unicode buffer.
     */
    AsciiString = OriginalObject->String.Pointer;
    UnicodeLength = (OriginalObject->String.Length * 2) + 2;

    /* Create a new buffer object for the Unicode data */

    NewObject = AcpiUtCreateBufferObject (UnicodeLength);
    if (!NewObject)
    {
        return (AE_NO_MEMORY);
    }

    UnicodeBuffer = ACPI_CAST_PTR (UINT16, NewObject->Buffer.Pointer);

    /* Convert ASCII to Unicode */

    for (i = 0; i < OriginalObject->String.Length; i++)
    {
        UnicodeBuffer[i] = (UINT16) AsciiString[i];
    }

    *ReturnObject = NewObject;
    return (AE_OK);
}

ACPI_STATUS
AcpiExConvertToBuffer (
    ACPI_OPERAND_OBJECT     *ObjDesc,
    ACPI_OPERAND_OBJECT     **ResultDesc)
{
    ACPI_OPERAND_OBJECT     *ReturnDesc;
    UINT8                   *NewBuf;


    ACPI_FUNCTION_TRACE_PTR (ExConvertToBuffer, ObjDesc);


    switch (ObjDesc->Common.Type)
    {
    case ACPI_TYPE_BUFFER:

        /* No conversion necessary */

        *ResultDesc = ObjDesc;
        return_ACPI_STATUS (AE_OK);


    case ACPI_TYPE_INTEGER:
        /*
         * Create a new Buffer object.
         * Need enough space for one integer
         */
        ReturnDesc = AcpiUtCreateBufferObject (AcpiGbl_IntegerByteWidth);
        if (!ReturnDesc)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        /* Copy the integer to the buffer, LSB first */

        NewBuf = ReturnDesc->Buffer.Pointer;
        ACPI_MEMCPY (NewBuf,
                        &ObjDesc->Integer.Value,
                        AcpiGbl_IntegerByteWidth);
        break;

    case ACPI_TYPE_STRING:
        /*
         * Create a new Buffer object
         * Size will be the string length
         *
         * NOTE: Add one to the string length to include the null terminator.
         * The ACPI spec is unclear on this subject, but there is existing
         * ASL/AML code that depends on the null being transferred to the new
         * buffer.
         */
        ReturnDesc = AcpiUtCreateBufferObject (
                        (ACPI_SIZE) ObjDesc->String.Length + 1);
        if (!ReturnDesc)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        /* Copy the string to the buffer */

        NewBuf = ReturnDesc->Buffer.Pointer;
        ACPI_STRNCPY ((char *) NewBuf, (char *) ObjDesc->String.Pointer,
            ObjDesc->String.Length);
        break;

    default:

        return_ACPI_STATUS (AE_TYPE);
    }

    /* Mark buffer initialized */

    ReturnDesc->Common.Flags |= AOPOBJ_DATA_VALID;
    *ResultDesc = ReturnDesc;
    return_ACPI_STATUS (AE_OK);
}

static ACPI_STATUS
AcpiNsRepair_FDE (
    ACPI_EVALUATE_INFO      *Info,
    ACPI_OPERAND_OBJECT     **ReturnObjectPtr)
{
    ACPI_OPERAND_OBJECT     *ReturnObject = *ReturnObjectPtr;
    ACPI_OPERAND_OBJECT     *BufferObject;
    UINT8                   *ByteBuffer;
    UINT32                  *DwordBuffer;
    UINT32                  i;


    ACPI_FUNCTION_NAME (NsRepair_FDE);


    switch (ReturnObject->Common.Type)
    {
    case ACPI_TYPE_BUFFER:

        /* This is the expected type. Length should be (at least) 5 DWORDs */

        if (ReturnObject->Buffer.Length >= ACPI_FDE_DWORD_BUFFER_SIZE)
        {
            return (AE_OK);
        }

        /* We can only repair if we have exactly 5 BYTEs */

        if (ReturnObject->Buffer.Length != ACPI_FDE_BYTE_BUFFER_SIZE)
        {
            ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, Info->NodeFlags,
                "Incorrect return buffer length %u, expected %u",
                ReturnObject->Buffer.Length, ACPI_FDE_DWORD_BUFFER_SIZE));

            return (AE_AML_OPERAND_TYPE);
        }

        /* Create the new (larger) buffer object */

        BufferObject = AcpiUtCreateBufferObject (ACPI_FDE_DWORD_BUFFER_SIZE);
        if (!BufferObject)
        {
            return (AE_NO_MEMORY);
        }

        /* Expand each byte to a DWORD */

        ByteBuffer = ReturnObject->Buffer.Pointer;
        DwordBuffer = ACPI_CAST_PTR (UINT32, BufferObject->Buffer.Pointer);

        for (i = 0; i < ACPI_FDE_FIELD_COUNT; i++)
        {
            *DwordBuffer = (UINT32) *ByteBuffer;
            DwordBuffer++;
            ByteBuffer++;
        }

        ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
            "%s Expanded Byte Buffer to expected DWord Buffer\n",
            Info->FullPathname));
        break;

    default:

        return (AE_AML_OPERAND_TYPE);
    }

    /* Delete the original return object, return the new buffer object */

    AcpiUtRemoveReference (ReturnObject);
    *ReturnObjectPtr = BufferObject;

    Info->ReturnFlags |= ACPI_OBJECT_REPAIRED;
    return (AE_OK);
}

ACPI_STATUS
AcpiNsConvertToResource (
    ACPI_NAMESPACE_NODE     *Scope,
    ACPI_OPERAND_OBJECT     *OriginalObject,
    ACPI_OPERAND_OBJECT     **ReturnObject)
{
    ACPI_OPERAND_OBJECT     *NewObject;
    UINT8                   *Buffer;


    /*
     * We can fix the following cases for an expected resource template:
     * 1. No return value (interpreter slack mode is disabled)
     * 2. A "Return (Zero)" statement
     * 3. A "Return empty buffer" statement
     *
     * We will return a buffer containing a single EndTag
     * resource descriptor.
     */
    if (OriginalObject)
    {
        switch (OriginalObject->Common.Type)
        {
        case ACPI_TYPE_INTEGER:

            /* We can only repair an Integer==0 */

            if (OriginalObject->Integer.Value)
            {
                return (AE_AML_OPERAND_TYPE);
            }
            break;

        case ACPI_TYPE_BUFFER:

            if (OriginalObject->Buffer.Length)
            {
                /* Additional checks can be added in the future */

                *ReturnObject = NULL;
                return (AE_OK);
            }
            break;

        case ACPI_TYPE_STRING:
        default:

            return (AE_AML_OPERAND_TYPE);
        }
    }

    /* Create the new buffer object for the resource descriptor */

    NewObject = AcpiUtCreateBufferObject (2);
    if (!NewObject)
    {
        return (AE_NO_MEMORY);
    }

    Buffer = ACPI_CAST_PTR (UINT8, NewObject->Buffer.Pointer);

    /* Initialize the Buffer with a single EndTag descriptor */

    Buffer[0] = (ACPI_RESOURCE_NAME_END_TAG | ASL_RDESC_END_TAG_SIZE);
    Buffer[1] = 0x00;

    *ReturnObject = NewObject;
    return (AE_OK);
}

ACPI_STATUS
AcpiNsConvertToBuffer (
    ACPI_OPERAND_OBJECT     *OriginalObject,
    ACPI_OPERAND_OBJECT     **ReturnObject)
{
    ACPI_OPERAND_OBJECT     *NewObject;
    ACPI_STATUS             Status;
    ACPI_OPERAND_OBJECT     **Elements;
    UINT32                  *DwordBuffer;
    UINT32                  Count;
    UINT32                  i;


    switch (OriginalObject->Common.Type)
    {
    case ACPI_TYPE_INTEGER:
        /*
         * Integer-to-Buffer conversion.
         * Convert the Integer to a packed-byte buffer. _MAT and other
         * objects need this sometimes, if a read has been performed on a
         * Field object that is less than or equal to the global integer
         * size (32 or 64 bits).
         */
        Status = AcpiExConvertToBuffer (OriginalObject, &NewObject);
        if (ACPI_FAILURE (Status))
        {
            return (Status);
        }
        break;

    case ACPI_TYPE_STRING:

        /* String-to-Buffer conversion. Simple data copy */

        NewObject = AcpiUtCreateBufferObject
            (OriginalObject->String.Length);
        if (!NewObject)
        {
            return (AE_NO_MEMORY);
        }

        memcpy (NewObject->Buffer.Pointer,
            OriginalObject->String.Pointer, OriginalObject->String.Length);
        break;

    case ACPI_TYPE_PACKAGE:
        /*
         * This case is often seen for predefined names that must return a
         * Buffer object with multiple DWORD integers within. For example,
         * _FDE and _GTM. The Package can be converted to a Buffer.
         */

        /* All elements of the Package must be integers */

        Elements = OriginalObject->Package.Elements;
        Count = OriginalObject->Package.Count;

        for (i = 0; i < Count; i++)
        {
            if ((!*Elements) ||
                ((*Elements)->Common.Type != ACPI_TYPE_INTEGER))
            {
                return (AE_AML_OPERAND_TYPE);
            }
            Elements++;
        }

        /* Create the new buffer object to replace the Package */

        NewObject = AcpiUtCreateBufferObject (ACPI_MUL_4 (Count));
        if (!NewObject)
        {
            return (AE_NO_MEMORY);
        }

        /* Copy the package elements (integers) to the buffer as DWORDs */

        Elements = OriginalObject->Package.Elements;
        DwordBuffer = ACPI_CAST_PTR (UINT32, NewObject->Buffer.Pointer);

        for (i = 0; i < Count; i++)
        {
            *DwordBuffer = (UINT32) (*Elements)->Integer.Value;
            DwordBuffer++;
            Elements++;
        }
        break;

    default:

        return (AE_AML_OPERAND_TYPE);
    }

    *ReturnObject = NewObject;
    return (AE_OK);
}

ACPI_STATUS
AcpiExDoConcatenate (
    ACPI_OPERAND_OBJECT     *Operand0,
    ACPI_OPERAND_OBJECT     *Operand1,
    ACPI_OPERAND_OBJECT     **ActualReturnDesc,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_OPERAND_OBJECT     *LocalOperand1 = Operand1;
    ACPI_OPERAND_OBJECT     *ReturnDesc;
    char                    *NewBuf;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (ExDoConcatenate);


    /*
     * Convert the second operand if necessary.  The first operand
     * determines the type of the second operand, (See the Data Types
     * section of the ACPI specification.)  Both object types are
     * guaranteed to be either Integer/String/Buffer by the operand
     * resolution mechanism.
     */
    switch (ACPI_GET_OBJECT_TYPE (Operand0))
    {
    case ACPI_TYPE_INTEGER:
        Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16);
        break;

    case ACPI_TYPE_STRING:
        Status = AcpiExConvertToString (Operand1, &LocalOperand1,
                    ACPI_IMPLICIT_CONVERT_HEX);
        break;

    case ACPI_TYPE_BUFFER:
        Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1);
        break;

    default:
        ACPI_ERROR ((AE_INFO, "Invalid object type: %X",
            ACPI_GET_OBJECT_TYPE (Operand0)));
        Status = AE_AML_INTERNAL;
    }

    if (ACPI_FAILURE (Status))
    {
        goto Cleanup;
    }

    /*
     * Both operands are now known to be the same object type
     * (Both are Integer, String, or Buffer), and we can now perform the
     * concatenation.
     */

    /*
     * There are three cases to handle:
     *
     * 1) Two Integers concatenated to produce a new Buffer
     * 2) Two Strings concatenated to produce a new String
     * 3) Two Buffers concatenated to produce a new Buffer
     */
    switch (ACPI_GET_OBJECT_TYPE (Operand0))
    {
    case ACPI_TYPE_INTEGER:

        /* Result of two Integers is a Buffer */
        /* Need enough buffer space for two integers */

        ReturnDesc = AcpiUtCreateBufferObject ((ACPI_SIZE)
                            ACPI_MUL_2 (AcpiGbl_IntegerByteWidth));
        if (!ReturnDesc)
        {
            Status = AE_NO_MEMORY;
            goto Cleanup;
        }

        NewBuf = (char *) ReturnDesc->Buffer.Pointer;

        /* Copy the first integer, LSB first */

        ACPI_MEMCPY (NewBuf, &Operand0->Integer.Value,
                        AcpiGbl_IntegerByteWidth);

        /* Copy the second integer (LSB first) after the first */

        ACPI_MEMCPY (NewBuf + AcpiGbl_IntegerByteWidth,
                        &LocalOperand1->Integer.Value,
                        AcpiGbl_IntegerByteWidth);
        break;

    case ACPI_TYPE_STRING:

        /* Result of two Strings is a String */

        ReturnDesc = AcpiUtCreateStringObject ((ACPI_SIZE)
                        (Operand0->String.Length +
                        LocalOperand1->String.Length));
        if (!ReturnDesc)
        {
//.........这里部分代码省略.........

ACPI_STATUS
AcpiNsRepairNullElement (
    ACPI_EVALUATE_INFO      *Info,
    UINT32                  ExpectedBtypes,
    UINT32                  PackageIndex,
    ACPI_OPERAND_OBJECT     **ReturnObjectPtr)
{
    ACPI_OPERAND_OBJECT     *ReturnObject = *ReturnObjectPtr;
    ACPI_OPERAND_OBJECT     *NewObject;


    ACPI_FUNCTION_NAME (NsRepairNullElement);


    /* No repair needed if return object is non-NULL */

    if (ReturnObject)
    {
        return (AE_OK);
    }

    /*
     * Attempt to repair a NULL element of a Package object. This applies to
     * predefined names that return a fixed-length package and each element
     * is required. It does not apply to variable-length packages where NULL
     * elements are allowed, especially at the end of the package.
     */
    if (ExpectedBtypes & ACPI_RTYPE_INTEGER)
    {
        /* Need an Integer - create a zero-value integer */

        NewObject = AcpiUtCreateIntegerObject ((UINT64) 0);
    }
    else if (ExpectedBtypes & ACPI_RTYPE_STRING)
    {
        /* Need a String - create a NULL string */

        NewObject = AcpiUtCreateStringObject (0);
    }
    else if (ExpectedBtypes & ACPI_RTYPE_BUFFER)
    {
        /* Need a Buffer - create a zero-length buffer */

        NewObject = AcpiUtCreateBufferObject (0);
    }
    else
    {
        /* Error for all other expected types */

        return (AE_AML_OPERAND_TYPE);
    }

    if (!NewObject)
    {
        return (AE_NO_MEMORY);
    }

    /* Set the reference count according to the parent Package object */

    NewObject->Common.ReferenceCount =
        Info->ParentPackage->Common.ReferenceCount;

    ACPI_DEBUG_PRINT ((ACPI_DB_REPAIR,
        "%s: Converted NULL package element to expected %s at index %u\n",
        Info->FullPathname, AcpiUtGetObjectTypeName (NewObject),
        PackageIndex));

    *ReturnObjectPtr = NewObject;
    Info->ReturnFlags |= ACPI_OBJECT_REPAIRED;
    return (AE_OK);
}

ACPI_STATUS
AcpiExReadDataFromField (
    ACPI_WALK_STATE         *WalkState,
    ACPI_OPERAND_OBJECT     *ObjDesc,
    ACPI_OPERAND_OBJECT     **RetBufferDesc)
{
    ACPI_STATUS             Status;
    ACPI_OPERAND_OBJECT     *BufferDesc;
    ACPI_SIZE               Length;
    void                    *Buffer;
    UINT32                  Function;


    ACPI_FUNCTION_TRACE_PTR (ExReadDataFromField, ObjDesc);


    /* Parameter validation */

    if (!ObjDesc)
    {
        return_ACPI_STATUS (AE_AML_NO_OPERAND);
    }
    if (!RetBufferDesc)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
    {
        /*
         * If the BufferField arguments have not been previously evaluated,
         * evaluate them now and save the results.
         */
        if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
        {
            Status = AcpiDsGetBufferFieldArguments (ObjDesc);
            if (ACPI_FAILURE (Status))
            {
                return_ACPI_STATUS (Status);
            }
        }
    }
    else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
             (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
              ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
              ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
    {
        /*
         * This is an SMBus, GSBus or IPMI read. We must create a buffer to hold
         * the data and then directly access the region handler.
         *
         * Note: SMBus and GSBus protocol value is passed in upper 16-bits of Function
         */
        if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS)
        {
            Length = ACPI_SMBUS_BUFFER_SIZE;
            Function = ACPI_READ | (ObjDesc->Field.Attribute << 16);
        }
        else if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS)
        {
            Length = ACPI_GSBUS_BUFFER_SIZE;
            Function = ACPI_READ | (ObjDesc->Field.Attribute << 16);
        }
        else /* IPMI */
        {
            Length = ACPI_IPMI_BUFFER_SIZE;
            Function = ACPI_READ;
        }

        BufferDesc = AcpiUtCreateBufferObject (Length);
        if (!BufferDesc)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        /* Lock entire transaction if requested */

        AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);

        /* Call the region handler for the read */

        Status = AcpiExAccessRegion (ObjDesc, 0,
                    ACPI_CAST_PTR (UINT64, BufferDesc->Buffer.Pointer),
                    Function);
        AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
        goto Exit;
    }

    /*
     * Allocate a buffer for the contents of the field.
     *
     * If the field is larger than the current integer width, create
     * a BUFFER to hold it.  Otherwise, use an INTEGER.  This allows
     * the use of arithmetic operators on the returned value if the
     * field size is equal or smaller than an Integer.
     *
     * Note: Field.length is in bits.
     */
    Length = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->Field.BitLength);
    if (Length > AcpiGbl_IntegerByteWidth)
//.........这里部分代码省略.........

ACPI_STATUS
AcpiExWriteDataToField (
    ACPI_OPERAND_OBJECT     *SourceDesc,
    ACPI_OPERAND_OBJECT     *ObjDesc,
    ACPI_OPERAND_OBJECT     **ResultDesc)
{
    ACPI_STATUS             Status;
    UINT32                  Length;
    void                    *Buffer;
    ACPI_OPERAND_OBJECT     *BufferDesc;
    UINT32                  Function;


    ACPI_FUNCTION_TRACE_PTR (ExWriteDataToField, ObjDesc);


    /* Parameter validation */

    if (!SourceDesc || !ObjDesc)
    {
        return_ACPI_STATUS (AE_AML_NO_OPERAND);
    }

    if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
    {
        /*
         * If the BufferField arguments have not been previously evaluated,
         * evaluate them now and save the results.
         */
        if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
        {
            Status = AcpiDsGetBufferFieldArguments (ObjDesc);
            if (ACPI_FAILURE (Status))
            {
                return_ACPI_STATUS (Status);
            }
        }
    }
    else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
             (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
              ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
              ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
    {
        /*
         * This is an SMBus, GSBus or IPMI write. We will bypass the entire field
         * mechanism and handoff the buffer directly to the handler. For
         * these address spaces, the buffer is bi-directional; on a write,
         * return data is returned in the same buffer.
         *
         * Source must be a buffer of sufficient size:
         * ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
         *
         * Note: SMBus and GSBus protocol type is passed in upper 16-bits of Function
         */
        if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
        {
            ACPI_ERROR ((AE_INFO,
                "SMBus/IPMI/GenericSerialBus write requires Buffer, found type %s",
                AcpiUtGetObjectTypeName (SourceDesc)));

            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
        }

        if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS)
        {
            Length = ACPI_SMBUS_BUFFER_SIZE;
            Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16);
        }
        else if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS)
        {
            Length = ACPI_GSBUS_BUFFER_SIZE;
            Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16);
        }
        else /* IPMI */
        {
            Length = ACPI_IPMI_BUFFER_SIZE;
            Function = ACPI_WRITE;
        }

        if (SourceDesc->Buffer.Length < Length)
        {
            ACPI_ERROR ((AE_INFO,
                "SMBus/IPMI/GenericSerialBus write requires Buffer of length %u, found length %u",
                Length, SourceDesc->Buffer.Length));

            return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
        }

        /* Create the bi-directional buffer */

        BufferDesc = AcpiUtCreateBufferObject (Length);
        if (!BufferDesc)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        Buffer = BufferDesc->Buffer.Pointer;
        ACPI_MEMCPY (Buffer, SourceDesc->Buffer.Pointer, Length);

        /* Lock entire transaction if requested */
//.........这里部分代码省略.........

//.........这里部分代码省略.........
        {
            AccessorType = ObjDesc->Field.Attribute;
            Length = AcpiExGetSerialAccessLength (
                AccessorType, ObjDesc->Field.AccessLength);

            /*
             * Add additional 2 bytes for the GenericSerialBus data buffer:
             *
             *     Status;    (Byte 0 of the data buffer)
             *     Length;    (Byte 1 of the data buffer)
             *     Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
             */
            Length += 2;
            Function = ACPI_WRITE | (AccessorType << 16);
        }
        else /* IPMI */
        {
            Length = ACPI_IPMI_BUFFER_SIZE;
            Function = ACPI_WRITE;
        }

        if (SourceDesc->Buffer.Length < Length)
        {
            ACPI_ERROR ((AE_INFO,
                "SMBus/IPMI/GenericSerialBus write requires "
                "Buffer of length %u, found length %u",
                Length, SourceDesc->Buffer.Length));

            return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
        }

        /* Create the bi-directional buffer */

        BufferDesc = AcpiUtCreateBufferObject (Length);
        if (!BufferDesc)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        Buffer = BufferDesc->Buffer.Pointer;
        memcpy (Buffer, SourceDesc->Buffer.Pointer, Length);

        /* Lock entire transaction if requested */

        AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);

        /*
         * Perform the write (returns status and perhaps data in the
         * same buffer)
         */
        Status = AcpiExAccessRegion (
            ObjDesc, 0, (UINT64 *) Buffer, Function);
        AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);

        *ResultDesc = BufferDesc;
        return_ACPI_STATUS (Status);
    }
    else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
             (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GPIO))
    {
        /*
         * For GPIO (GeneralPurposeIo), we will bypass the entire field
         * mechanism and handoff the bit address and bit width directly to
         * the handler. The Address will be the bit offset
         * from the previous Connection() operator, making it effectively a
         * pin number index. The BitLength is the length of the field, which

ACPI_STATUS
AcpiExDoConcatenate (
    ACPI_OPERAND_OBJECT     *ObjDesc1,
    ACPI_OPERAND_OBJECT     *ObjDesc2,
    ACPI_OPERAND_OBJECT     **ActualReturnDesc,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status;
    UINT32                  i;
    ACPI_INTEGER            ThisInteger;
    ACPI_OPERAND_OBJECT     *ReturnDesc;
    NATIVE_CHAR             *NewBuf;


    ACPI_FUNCTION_ENTRY ();


    /*
     * There are three cases to handle:
     *
     * 1) Two Integers concatenated to produce a new Buffer
     * 2) Two Strings concatenated to produce a new String
     * 3) Two Buffers concatenated to produce a new Buffer
     */
    switch (ACPI_GET_OBJECT_TYPE (ObjDesc1))
    {
    case ACPI_TYPE_INTEGER:

        /* Result of two Integers is a Buffer */
        /* Need enough buffer space for two integers */

        ReturnDesc = AcpiUtCreateBufferObject (AcpiGbl_IntegerByteWidth * 2);
        if (!ReturnDesc)
        {
            return (AE_NO_MEMORY);
        }

        NewBuf = (NATIVE_CHAR *) ReturnDesc->Buffer.Pointer;

        /* Convert the first integer */

        ThisInteger = ObjDesc1->Integer.Value;
        for (i = 0; i < AcpiGbl_IntegerByteWidth; i++)
        {
            NewBuf[i] = (NATIVE_CHAR) ThisInteger;
            ThisInteger >>= 8;
        }

        /* Convert the second integer */

        ThisInteger = ObjDesc2->Integer.Value;
        for (; i < (ACPI_MUL_2 (AcpiGbl_IntegerByteWidth)); i++)
        {
            NewBuf[i] = (NATIVE_CHAR) ThisInteger;
            ThisInteger >>= 8;
        }

        break;


    case ACPI_TYPE_STRING:

        /* Result of two Strings is a String */

        ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_STRING);
        if (!ReturnDesc)
        {
            return (AE_NO_MEMORY);
        }

        /* Operand0 is string  */

        NewBuf = ACPI_MEM_ALLOCATE ((ACPI_SIZE) ObjDesc1->String.Length +
                                    (ACPI_SIZE) ObjDesc2->String.Length + 1);
        if (!NewBuf)
        {
            ACPI_REPORT_ERROR
                (("ExDoConcatenate: String allocation failure\n"));
            Status = AE_NO_MEMORY;
            goto Cleanup;
        }

        /* Concatenate the strings */

        ACPI_STRCPY (NewBuf, ObjDesc1->String.Pointer);
        ACPI_STRCPY (NewBuf + ObjDesc1->String.Length,
                              ObjDesc2->String.Pointer);

        /* Complete the String object initialization */

        ReturnDesc->String.Pointer = NewBuf;
        ReturnDesc->String.Length  = ObjDesc1->String.Length +
                                     ObjDesc2->String.Length;
        break;


    case ACPI_TYPE_BUFFER:

        /* Result of two Buffers is a Buffer */

//.........这里部分代码省略.........

ACPI_STATUS
AcpiExWriteSerialBus (
    ACPI_OPERAND_OBJECT     *SourceDesc,
    ACPI_OPERAND_OBJECT     *ObjDesc,
    ACPI_OPERAND_OBJECT     **ReturnBuffer)
{
    ACPI_STATUS             Status;
    UINT32                  BufferLength;
    UINT32                  DataLength;
    void                    *Buffer;
    ACPI_OPERAND_OBJECT     *BufferDesc;
    UINT32                  Function;
    UINT16                  AccessorType;


    ACPI_FUNCTION_TRACE_PTR (ExWriteSerialBus, ObjDesc);


    /*
     * This is an SMBus, GSBus or IPMI write. We will bypass the entire
     * field mechanism and handoff the buffer directly to the handler.
     * For these address spaces, the buffer is bidirectional; on a
     * write, return data is returned in the same buffer.
     *
     * Source must be a buffer of sufficient size, these are fixed size:
     * ACPI_SMBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
     *
     * Note: SMBus and GSBus protocol type is passed in upper 16-bits
     * of Function
     *
     * Common buffer format:
     *     Status;    (Byte 0 of the data buffer)
     *     Length;    (Byte 1 of the data buffer)
     *     Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
     */
    if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
    {
        ACPI_ERROR ((AE_INFO,
            "SMBus/IPMI/GenericSerialBus write requires "
            "Buffer, found type %s",
            AcpiUtGetObjectTypeName (SourceDesc)));

        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
    }

    switch (ObjDesc->Field.RegionObj->Region.SpaceId)
    {
    case ACPI_ADR_SPACE_SMBUS:

        BufferLength = ACPI_SMBUS_BUFFER_SIZE;
        Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16);
        break;

    case ACPI_ADR_SPACE_IPMI:

        BufferLength = ACPI_IPMI_BUFFER_SIZE;
        Function = ACPI_WRITE;
        break;

    case ACPI_ADR_SPACE_GSBUS:

        AccessorType = ObjDesc->Field.Attribute;
        Status = AcpiExGetProtocolBufferLength (AccessorType, &BufferLength);
        if (ACPI_FAILURE (Status))
        {
            ACPI_ERROR ((AE_INFO,
                "Invalid protocol ID for GSBus: 0x%4.4X", AccessorType));

            return_ACPI_STATUS (Status);
        }

        /* Add header length to get the full size of the buffer */

        BufferLength += ACPI_SERIAL_HEADER_SIZE;
        Function = ACPI_WRITE | (AccessorType << 16);
        break;

    default:
        return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID);
    }

    /* Create the transfer/bidirectional/return buffer */

    BufferDesc = AcpiUtCreateBufferObject (BufferLength);
    if (!BufferDesc)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    /* Copy the input buffer data to the transfer buffer */

    Buffer = BufferDesc->Buffer.Pointer;
    DataLength = (BufferLength < SourceDesc->Buffer.Length ?
        BufferLength : SourceDesc->Buffer.Length);
    memcpy (Buffer, SourceDesc->Buffer.Pointer, DataLength);

    /* Lock entire transaction if requested */

    AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);

//.........这里部分代码省略.........

ACPI_STATUS
AcpiExReadSerialBus (
    ACPI_OPERAND_OBJECT     *ObjDesc,
    ACPI_OPERAND_OBJECT     **ReturnBuffer)
{
    ACPI_STATUS             Status;
    UINT32                  BufferLength;
    ACPI_OPERAND_OBJECT     *BufferDesc;
    UINT32                  Function;
    UINT16                  AccessorType;


    ACPI_FUNCTION_TRACE_PTR (ExReadSerialBus, ObjDesc);


    /*
     * This is an SMBus, GSBus or IPMI read. We must create a buffer to
     * hold the data and then directly access the region handler.
     *
     * Note: SMBus and GSBus protocol value is passed in upper 16-bits
     * of Function
     *
     * Common buffer format:
     *     Status;    (Byte 0 of the data buffer)
     *     Length;    (Byte 1 of the data buffer)
     *     Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
     */
    switch (ObjDesc->Field.RegionObj->Region.SpaceId)
    {
    case ACPI_ADR_SPACE_SMBUS:

        BufferLength = ACPI_SMBUS_BUFFER_SIZE;
        Function = ACPI_READ | (ObjDesc->Field.Attribute << 16);
        break;

    case ACPI_ADR_SPACE_IPMI:

        BufferLength = ACPI_IPMI_BUFFER_SIZE;
        Function = ACPI_READ;
        break;

    case ACPI_ADR_SPACE_GSBUS:

        AccessorType = ObjDesc->Field.Attribute;
        if (AccessorType == AML_FIELD_ATTRIB_RAW_PROCESS_BYTES)
        {
            ACPI_ERROR ((AE_INFO,
                "Invalid direct read using bidirectional write-then-read protocol"));

            return_ACPI_STATUS (AE_AML_PROTOCOL);
        }

        Status = AcpiExGetProtocolBufferLength (AccessorType, &BufferLength);
        if (ACPI_FAILURE (Status))
        {
            ACPI_ERROR ((AE_INFO,
                "Invalid protocol ID for GSBus: 0x%4.4X", AccessorType));

            return_ACPI_STATUS (Status);
        }

        /* Add header length to get the full size of the buffer */

        BufferLength += ACPI_SERIAL_HEADER_SIZE;
        Function = ACPI_READ | (AccessorType << 16);
        break;

    default:
        return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID);
    }

    /* Create the local transfer buffer that is returned to the caller */

    BufferDesc = AcpiUtCreateBufferObject (BufferLength);
    if (!BufferDesc)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    /* Lock entire transaction if requested */

    AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);

    /* Call the region handler for the write-then-read */

    Status = AcpiExAccessRegion (ObjDesc, 0,
        ACPI_CAST_PTR (UINT64, BufferDesc->Buffer.Pointer), Function);
    AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);

    *ReturnBuffer = BufferDesc;
    return_ACPI_STATUS (Status);
}